Do the processes in main memory have a process control block ?Or a PCB for a process is formed when it enters the ready queue

Question

Do the processes in main memory have a process control block ?Or a PCB for a process is formed when it enters the ready queue. Long-term schedular bring the process from memory(hard disk) or main memory(ram) to the ready queue?

Answer 1

Every process (i.e., everything with a process id) has a PCB, and the PCB is required to insert the process in the ready queue.

A long term scheduler decides which submitted jobs become processes, and turns jobs into processes. Part of turning a job into a process will involve creating the PCB.